Langlois, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.6 °C (low) to 16.1 °C (high). Annual precipitation averages 1786.1 Millimeters. Langlois is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.9 °C | 12.4 °C | 294.13 mm |
| February | 4.7 °C | 12.7 °C | 221.74 mm |
| March | 5.2 °C | 12.9 °C | 230.38 mm |
| April | 6.1 °C | 14.5 °C | 174.24 mm |
| May | 8.1 °C | 16.6 °C | 88.39 mm |
| June | 9.9 °C | 18.2 °C | 49.78 mm |
| July | 11.3 °C | 20.1 °C | 9.14 mm |
| August | 11.2 °C | 20.6 °C | 14.73 mm |
| September | 10.1 °C | 20.4 °C | 38.35 mm |
| October | 8.3 °C | 18.1 °C | 109.98 mm |
| November | 6.3 °C | 14.1 °C | 236.73 mm |
| December | 4.8 °C | 12.2 °C | 318.52 mm |
| Annual | 7.6 °C | 16.1 °C | 1786.11 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |